Find in a Kiehl's store

HEPES (Hydroxyethylpiperazine Ethane Sulfonic Acid)

HEPES, or Hydroxyethylpiperazine Ethane Sulfonic Acid, is a chemical buffer which is widely used in cell culture to maintain physiological pH. This amino-sulfonic derivative helps to improve skin and limits roughness.

Sodium Hyaluronate

Sodium Hyaluronate is the sodium salt of Hyaluronic Acid. It is used as a moisturizing agent, viscosifier and emulsifier. It forms a transparent film on the skin which has a soothing and lubricating action. It is a powerful humectant as it is capable of binding 1,800 times its own weight in water. See also: Hyaluronic Acid.

Urea

An enzyme activator naturally present in the surface layer of the skin (epidermis), Urea accelerates the natural process of cell renewal through the exfoliation of dead surface skin cells. The ingredient has a water binding effect in the top layers of the skin thus acting as a natural moisturizing agent in human skin.

How to Apply:-Cleanse skin thoroughly prior to application
-Apply face peel at night, avoiding immediate eye area, and allow to dry on skin
-Leave on overnight and remove with warm water in the morning
-Use three times per week, or more as needed

HEPES (Hydroxyethylpiperazine Ethane Sulfonic Acid)

HEPES, or Hydroxyethylpiperazine Ethane Sulfonic Acid, is a chemical buffer which is widely used in cell culture to maintain physiological pH. This amino-sulfonic derivative helps to improve skin and limits roughness.

Sodium Hyaluronate

Sodium Hyaluronate is the sodium salt of Hyaluronic Acid. It is used as a moisturizing agent, viscosifier and emulsifier. It forms a transparent film on the skin which has a soothing and lubricating action. It is a powerful humectant as it is capable of binding 1,800 times its own weight in water. See also: Hyaluronic Acid.

Urea

An enzyme activator naturally present in the surface layer of the skin (epidermis), Urea accelerates the natural process of cell renewal through the exfoliation of dead surface skin cells. The ingredient has a water binding effect in the top layers of the skin thus acting as a natural moisturizing agent in human skin.

How to Apply:-Cleanse skin thoroughly prior to application
-Apply face peel at night, avoiding immediate eye area, and allow to dry on skin
-Leave on overnight and remove with warm water in the morning
-Use three times per week, or more as needed

Rated 1 out of 5 by Valleri Don't see any results
really... not sure how long should i wait to see any results . My skin is very sensitive and i was looking for a peel that not is gonna be too strong for my skin. So i chose this one. The texture is weird. Its too thick and its not comfy to sleep bc it stays on my pillow case ... And i think it makes my skin even worse. I will try to use it longer but i feel bad paying this much and don't get any results . Really happy for those who does see it.
4/2/15

Rated 4 out of 5 by Yellow323 My doubts vanished...along with my pimples, flaky skin, & fine lines!
I got this as an alternative to using Retin A while pregnant. With the first couple of uses, I was skeptical. The texture is thick & tacky & it never really absorbs into my skin. I honestly felt like more was rubbing off onto my pillowcase at night. After a solid two weeks of usage, at 3xs per week, I have to admit that any doubts I had about this product vanished, along with some pregnancy related pimples, flaky skin, and fine lines! My skin feels smoother, looks tighter, & is more luminous. So happy to have found this product! Will continue to use it after the baby is born!
2/17/15

Rated 1 out of 5 by Lisa20 Parabens?
I was excited to try this product. It came as a sample with my argan hair pak (which I love). I read all the reviews and couldn't wait to use it. Then I read the ingredients. I was not excited to see that this product has 4 different parabens in it. Unfortunately, I will not be trying it.
5/31/14

Rated 5 out of 5 by Eliza Effective results
The serum is effective when used consistently - the results are gradual, which is preferred rather than over drying.
Product made my oily skin more evenly toned and improved the texture and feel.
Highly recommended!
5/25/14

Rated 4 out of 5 by ChicagotoCalifornia Makes skin glow in the morning
The Over-night Biological Peel feels creamy with a little texture to it, but glows when it's put on at night. In the morning, my skin looks fresh and dewy and lovely.
5/21/14

Rated 4 out of 5 by Nicolette Great product for troubled skin
As someone who has had problem skin since my teenage years, I'm always on the lookout for skincare products to combat my less-than-flawless face. Once I became hip to chemical peels, I began my search for a product to try. The thought of shelling out $300 dollars for a doctor to burn the top layer of my face off terrified me, so I read review after review for in-home options.
When I heard about Kiehl's Over-Night Biological Peel, it clicked that this would be right for me. This serum is PERFECT for those of us with sensitive, problem-prone skin. It's gentle enough to be used a few times a week, it's super easy to apply and doesn't smell awful like some other products I've heard about, and applying it right before going to sleep is such an effortless addition to my bedtime routine.
The Over-Night Biological Peel reads well on paper, but the proof is really in the pudding, so-to-speak. After ONE use, I noticed a difference in my skin. My pores appeared smaller, my skin was SOOO soft, and after a week or two of regular use (about 3 times per week) my breakouts have become less frequent and my scars have rapidly faded.
This is definitely a product that I'm so grateful for, and will be a staple in my skincare routine for a long time to come. Thank you, Kiehl's, for helping put my best face forward!
5/20/14

Rated 5 out of 5 by Dengdeng AmaZing
I have smallpoxes since high school and there're red spots on my skin after the poxes went down. This product helps to smoothen my my skin and demolish the old red spots! Super satisfied.
5/20/14

Rated 5 out of 5 by Kimesca Had me at HELLO!
What a great product! It goes on so easily, absorbs quickly, and when I wake up, my skin looks and feel smoother, younger and more even in texture. It has helped my hyperpigmentation improve greatly and isn't harsh or drying on my combo/oily skin.
5/20/14